# Below are detailed instructions for using the EMS load calculator.

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1 Introduction The EMS load calculator is designed to make load calculating as painless as possible. For sizing the equipment, only the first three tabs (Steps 1, 2 & 3) need to be completed. This process should take only 5-10 minutes. Acquiring the house measurements, however, will take a bit longer. No program will measure the house for you. Therefore, you must physically measure the house or get the dimensions off a plan. This may take minutes. If you need help with calculating dimensions go to our home page. and click on NEED TO BRUSH UP ON CONTRACTOR MATH. When physically measuring a house, it is easiest to first, draw the footprint of the house as you walk around it on the outside. Then walk around it again and write down the measurements and notes as you go. If you try to write down measurements as you walk around the first time. You will surely get your drawing all messed up. north 4x5 East 44 3x3 4x5 10 3x7 door 1/2 glass 12 4x5 4x5 3x3 south 42 Notes 1.5 overhang E&W Windows.75 ft. from OH Double glass R1 1 walls R30 ceiling No insulation floor 9 f t. c e i l i n g Average tightness 44 3x7 door 7x5 4x5 4x5 3 x5 3 x5 3 x *Because room-by-room calculations are time consuming, Do not attempt to perform a room-by-room calculation unless you already have the job or until you get the job. A room-by-room calculation is only used to determine CFM for a forced air system, or convector sizing for boilers and electric baseboard. To perform a cost analysis, only the first three tabs (Step 1, 2 & 3) need to be completed. Below are detailed instructions for using the EMS load calculator.

2 TWO STORY SAMPLE HOME 1/2 between OH and window /2 OH 3 5 All windows are 3 x 5 Vented crawl space Vented crawl space North elevation East elevation 3 7 Vented crawl space South elevation Vented crawl space West elevation Home is located in Raleigh, NC 3440 heating degree days, 1500 cooling degree days, 20F winter outdoor temperature, 92F summer outdoor temperature, moderately humid. Windows vinyl, double glazed, Low-e Walls R-11 Ceilings R-1 9 Floors R-1 1 Tightness of construction Average Ductwork between floors, no insulation 9 ft. ceilings, 1 ft. between floors

3 Below is a step-by-step explanation for calculating a whole house (block) load using the above illustration? If you wish to calculate the load for each floor, a separate calculation should be performed for each. After completing the first three tabs a room-by-room or zone-by-zone calculation may be performed using the room-by-- room tab. Fill in company and customer information Step 1 Tab 1. Design conditions- Enter the winter indoor temperature (usually 70F) and the summer indoor temperature (usually 75F). The outdoor temperature will be the coldest and hottest temperature it normally gets for a typical season.(this is not the record temperatures; for Raleigh we will use 20F for the wintertime temperature and 92F for the summertime temperature) 2. Humidity- Select the humidity level for your area. 3. How tight is the house?- This house has a total area (sq. ft.) of 1232 sq. ft. Therefore, select average-under 1500 sq. ft. Note: If the entire house is over 1500 sq. ft. and a calculation is being performed on only one floor or zone that is less than 1500 sq. ft. then use over 1500 sq. ft. nevertheless. 5. Number of occupants- If number is unknown, use 1 person for each bedroom, then add 1. A three bedroom home would have 4 occupants.

4 Step 2 Tab A is "Distance of overhang from top of window (ft.)" B is "length of overhang" 6. Overhang characteristics-this section is used to determine the window area that is shaded by an overhang. If there are no overhangs or the top of the windows begin more than 1-1/2 ft. below the overhang do not fill in this section. Our house has an overhang on the north and south sides. The upper story windows begin within 6 from the overhang, therefore, they will be the only windows receiving some shade. Under SOUTH Enter.5 as the distance between the window and overhang (convert fractional feet to decimal equivalent- 1/2 ft. or 6 =.5 ft.) and enter 1.5 as the length of the overhang. Notice there is no place to enter the distances for north facing windows. This is because a north facing window is always shaded. The calculator knows this and automatically considers all north facing glass as shaded. 7. Solar gain through glass-enter the area (sq. ft.) of all glass facing each direction. If there are windows covered by porches, carports, awnings etc where they are always shaded then treat these windows as if they were facing north. Click the dropdown list to select the type of glass*. *If you wish to use the window manufacturer's specifications to determine the HTM, check the box labeled use mfgs specs. Then enter the latitude, U-value and SHGC. The calculated HTM s will automatically be placed in the appropriate cells. Skylight- If there are skylights, enter the sq. ft.

5 The column labeled Linear Ft. below OH- When values are entered in #6 above (Overhang Characteristics), the cell corresponding to the direction will become active. In our example, the south facing cell is active. Enter the total linear feet across the top of all windows affected by the overhang. There are three windows facing south on the second floor that are affected by the overhang, each has 3 feet across the top. In the active cell, enter 9 (3 ft. + 3 ft. +3 ft.). 8. Ducts Location- Select the ductwork location from the dropdown box. If the home has no ductwork (electric baseboard or space heaters) or the ducts are located within the building envelope, select, All duct work in conditioned space. Select attic temperature if ducts are in the attic, the R-value of the insulation, leakage rate (sealed or unsealed) and the area the duct work serves. The area the duct work serves will be the floor area of the home or zone. Because the ducts are between the floors on our sample home, the floor area served is only 616 sq. ft., not 1232 sq. ft. Insulation- Select the amount of duct insulation using dropdown

7 Basement tab- floors must be at least 2 ft. below grade to be considered a basement The values used for a basement are calculated as shown in the previous examples. Below are some precautions. Basement Walls- the area of the wall must be split between above grade and below grade. All walls within two feet of grade are considered above grade. All walls two feet and deeper are below grade. Basement Floors- enter the square feet not perimeter of basement floor. Cost analysis Tab This tab allows you to calculate operating cost, payback, rate of return and compare one system to another. Enter heating and cooling degree days. If you do not know the degree days for your area click on the map button or go to Air conditioning- enter the SEER and the cost per KWH for your area. Cents must be entered as.00 Example, twelve cents =.12

8 Heating- Click type of heating system in dropdown. Enter the AFUE (furnace efficiency) as a decimal, 80% must be entered as.80. Heat pump heating efficiency is the HSPF rating. Enter of fuel cost as \$/unit. (example,.08 = eight cents, 1.45 = \$1.45) Electric is sold by the KWHR Natural gas is sold by the therm or 100 cubic feet LP gas is sold by the gallon Oil is sold by the gallon Savings, payback and rate of return are displayed at bottom of window. Our example shows if the customer chooses a 15 seer heat pump over a 92% efficient propane furnace with a 13 seer air conditioner. He will spend \$1200 extra, but save \$917 annually, resulting in a 1.3 year payback or 76.5% return on his investment of \$1200

9 Room-by-room tab Using the loads calculated on step 3 determine the equipment size. (our example calls for a 2 ton heat pump, 24,000 BTUH). From the manufacturer s specs, determine the CFM and enter this value under SYSTEM CFM (800). Equipment total CFM must be entered in order for the program to determine the room CFM. After entering total equipment CFM, enter the building component area of each room as indicated below. Only enter areas that are exposed to the outdoor temperature. For example, the kitchen has four walls, but only two are exposed to the outdoor temperature. The kitchen also has a ceiling, but it is not exposed to outdoor temperature, therefore its area is not entered in the cell. The floor is exposed to outdoor temperatures, therefore, its area is entered in the appropriate cell. Note: The total loads on the Room-by-Room tab should equal the whole house loads on the Step 3 tab, however there may be a slight difference. This is because the shading factors from Step 2 tab are not considered in the Room-by-Room calculation. The CFM figures will be accurate within 5%. If the load differences between Step 3 tab the Room-by-Room tab are more than 5%, you may need to check your measurements. To assist you in determining the whole house load is equal to the room-by room load, click the check calculation button.

10 Air Duct tab Air ducts can only be sized if a Room-by-Room calculation is made. 1. Be sure to enter the system CFM in the Room-by- Room tab. (System cfm should be obtained from the Equipment Selection tab, Manual S) 2. Determine the duct system friction rate. If you know the measured length, equivalent length and available static pressure, enter the values in the top-left chart then check the auto box. The friction rate will be calculated for you. If you do not have the above information, you may unclick AUTO and enter an arbitrary friction rate, such as.08, in the Friction loss cell (This method is not recommended). 3. Since the home only has one duct system, you must determine which mode to size the duct system to. If you wish to size the system to work best on air conditioning, check the use cooling CFM box. 4. Check flex or metal duct. 5. Determine the number of outlets for each room.

11 Presto! The ducts are sized for you. Note the air velocity. If the trunk velocity is more than 900 FPM or the branch velocity is more than 700 FPM then you may wish to consider increasing the duct by one size. High velocities produce a noisy system. Converting round duct to rectangular The duct sizes are given in round duct sizes. If you wish to know the rectangular equivalent, enter the required duct diameter and one desired side measurement. The converter will give the other side measurement. In our example, the first section supply duct should be 13.9 round. If the space between floors allows for a maximum of 8 then the rectangular duct would measure 8 x Instructions for Equipment Selection tab

12 1. By clicking, thus checking Auto complete most of the items below will automatically be entered with data obtained from the calculation. 2. Otherwise, enter total heat loss, total heat gain and sensible gain. Latent heat gain, sens./total ratio, target temperature drop and approximate cooling cfm will automatically be calculated. 3. Enter outdoor and indoor design temperatures. Outdoor design temperatures are the lowest and highest temperatures you would expect to experience in your area. Indoor design temperatures are the temperatures you wish to maintain indoor. Manual J recommends 70 degree for winter and 75 for summer. 4. Enter the altitude above sea level for your area. Altitude effects equipment capacity. 5. Using the manufacture s specification sheets, enter the equipment manufacturer, model number and btuh output if a furnace or boiler is used for heating. For air conditioners and heat pumps, enter the cooling capacities associated with your area s outdoor design 63 degree wet bulb temperature (63 WB corresponds to 50% RH)

13 Below is an example of a typical performance data sheet for a 2.5 ton heat pump. The highlighted area is ARI s testing conditions (32,100 btuh total capacity, 78% or 25,000 btuh sensible capacity, therefore leaving 7100 btuh latent capacity.) However, if your area has an outdoor design temperature of 105 degrees, the total capacity of the unit will drop to 30,500 btuh, with 81% or 24,000 btuh sensible and the balance, 5500 btuh latent. TOTAL CAPACIY with altitude correction is the net capacity of the equipment at your area s altitude and must be considered when selecting equipment. Notice the Cooling cfm (rec.). This is the cfm recommended to control humidity in the cooling mode. Using the manufacture s specs (blower performance chart), enter the external static pressure* corresponding to the recommended cfm in the adjacent cell labeled, Ext. static pressure of blower. Once the external static pressure is entered, it will automatically be re-entered in the available static pressure section below In the available static pressure for duct system section, enter the pressure drops caused by each component in the system (coils, registers, dampers, etc.)

14 *The external static pressure is the pressure the air exerts upon the ductwork as it leaves the air handler. Some manufactures post an external static pressure that allows for a coil and/or filter in place (you must read footnotes to blower performance chart). If the external static pressure includes coils or filters leave the corresponding cells blank. If you do not know the pressure drops of the registers and grilles. The generic pressure drop exerted by registers and grilles is about.03. Therefore, enter.03 in the cell next to registers and.03 in the cell next to grilles. Other- enter manufactures stated pressure drop of any other items in the system. (electric strips, dampers etc.) these may be added together and entered as one total. *Available static pressure for duct (per 100 feet) - In order to assure the correct system cfm the ductwork must be sized based in this static pressure. *Once the available static pressure is known, it must be adjusted according to the ductwork s measured and equivalent lengths. This adjustment is commonly referred to as the friction rate. The friction rate is the pressure used on duct calculators and friction charts FR= (Adj. SP x 100)/ total effective length This calculation is automatically made on the duct sizing tab Supplemental heat needed for heat pump. From the manufactures specs enter the heat pump s capacity at 47 degrees F and 17 degrees F. The program will calculate the amount of supplemental heat needed expressed in both BTUH and KW To save a calculation SAVE AND PRINT Click FILE-SAVE AS, then, create a folder such as MY LOAD CALCS in DOCUMENTS. Name the file (Harry Homeowner) and click SAVE To print a report Click FILE-PRINT REPORT, then select the pages you wish to print, click PRINT Tip: To save paper and ink select and print only the pages of the report you need.

15 ENERGY MARKETING SERVICE

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